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How to map/configure 2 mail servers  behind a firewall on the same lan/subnet

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Last Modified: 2013-11-16
I have a firewall which has 2 mail server's public smtp and pop ips mapped to internal ips  via NAT one-to-one translation on ports 25 and port 110.
Example :
               Mail Server 1
               smtp.abc.com ( 66.92.81.1) map on (port 25) to 192.168.100.5                          
               pop.abc.com ( 66.92.81.2) map on  (port 110) to 192.168.100.6

               Mail Server 2
               smtp.xyz.com  ( 66.92.81.3) map on (port 25) to 192.168.100.10
               pop.xyz.com  ( 66.92.81.4) map on (port 110) to 192.168.100.11

The problem is if I turn both smtp servers on , 1 or the other emails does not work

How how should I map/configure the 2 mail servers or similar ports behind a firewall on the same lan/subnet ?
Whats the right way to do this?
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